Open AccessImproved design of a SIW long slot leaky wave antenna with low SLL
Author(s) -
Mahmoodi Malekshah Amin,
Majedi Mohammad Saeed,
Attari Amir Reza
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5443
Subject(s) - hfss , leakage (economics) , slot antenna , aperture (computer memory) , leaky wave antenna , optics , antenna aperture , side lobe , amplitude , waveguide , antenna (radio) , phase (matter) , acoustics , materials science , electronic engineering , physics , engineering , radiation pattern , microstrip antenna , electrical engineering , quantum mechanics , economics , macroeconomics
This study presents a new design for the substrate integrated waveguide (SIW) long slot leaky wave antenna (LWA) with narrow beam, low side lobe level (SLL) and low cross‐polarisation. To meet these specifications, the changes of phase constant, β , along the structure are compensated, the required leakage constant, α r , is determined more accurately by considering the loss and a straight slot along the antenna is used. In order to calculate the leakage constant of the leaky‐mode more accurately, thru‐reflect‐line method along with HFSS simulations is used. By properly determining the shape of SIW walls, the amount of leakage along the slot and the phase constant can be controlled. This results in a desired aperture amplitude and phase distribution. The presented LWA realises a Taylor distribution with a predefined SLL of −25 dB. Such a design also leads to a low cross‐polarisation level and narrow beam at centre frequency of 17 GHz. The measurement results are consistent with the simulation results.